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| Branco,Alexsandro; Pinto,Angelo C.; Braz Filho,Raimundo. |
| From the hexane and ethyl acetate extracts obtained from stems, roots and leaf sheaths of Vellozia graminifolia, a mixture of linear hydrocarbons, a mixture of pentacyclic triterpenes, five monoisoprenylated flavonoids and one labdane diterpene, (-)-ent-3beta-hydroxy-8(17)-labden-15-oic acid, were isolated. The linear hydrocarbons and minor triterpenes were identified in their corresponding mixtures by High Resolution Gas Chromatography (HRGC) and HRGC coupled to mass spectrometry. The major pentacyclic triterpenes and the diterpene were characterized by spectral data, including 2D NMR experiments, and chemical transformations. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vellozia graminifolia; Velloziaceae; Triterpenes; Diterpene; Flavonoids. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300005 |
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| Garcia,Queila Souza; Diniz,Izabella Scalabrini Saraiva. |
| Este trabalho teve como objetivo avaliar o comportamento germinativo de Vellozia gigantea N.L. Menezes & Mello-Silva, Vellozia glandulifera Goethart & Henrard e Vellozia variabilis Mart. ex Schult. & Schult. Os experimentos de germinação foram realizados em câmaras de germinação sob luz e escuro contínuos, nas temperaturas constantes de 15, 20, 25, 30, 35 e 40ºC. As sementes das espécies estudadas apresentaram altas percentagens de germinação na presença de luz nas temperaturas de 20 a 40ºC, sendo que V. glandulifera foi a única espécie cujas sementes germinaram na temperatura de 15ºC. No escuro, as sementes de V. glandulifera germinaram nas temperaturas de 20 a 40ºC, apresentando percentagens de germinação inferiores a 30%. As... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vellozia; Velloziaceae; Comportamento germinativo; Fotoblastismo positivo; Germinação. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000400001 |
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| Amaral,Marina Milanello do; Mello-Silva,Renato de. |
| In Velloziaceae, the number of subsidiary cells has been used to characterize species and support groups. Nevertheless, the homology of the stomatal types have not been scrutinized. Stomatal ontogenesis of Vellozia epidendroides and V. plicata, assigned to have tetracytic stomata, and of V. glauca and Barbacenia riparia, assigned to have paracytic stomata, were investigated. In the four species studied, stomata followed perigenic development. Subsidiary cells arise from oblique divisions of neighbouring cells of the guard mother cell (GMC). These cells are elongated and parallel to the longer axis of the stoma. Polar cells show wide variation, following the shape and size of the epidermal cells in the vicinity. Hence, these cells cannot be called... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ontogenesis; Paracytic; Stomata; Tetracytic; Velloziaceae. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042008000300016 |
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